Question

factorise x²-x-72 by splitting the "x" term method​

Answer 1

Answer:

(x+8)(x−9)

Step-by-step explanation:

Let's factor x2−x−72

x2−x−72

The middle number is -1 and the last number is -72.

Factoring means we want something like

(x+_)(x+_)

Which numbers go in the blanks?

We need two numbers that...

Add together to get -1

Multiply together to get -72

Can you think of the two numbers?

Try 8 and -9:

8+-9 = -1

8*-9 = -72

Fill in the blanks in

(x+_)(x+_)

with 8 and -9 to get...

(x+8)(x-9)

Answer:

(x+8)(x−9)